Steam-boiler setting



(No Model.) 2 Sheets-Sheet 1.

M. E. HERSHEY.

STEAM BOILER SETTING.

No. 892,428. PatentedNov. 6, 1888.

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' 2 Sheets-Sheet 2.

(No Model) M. B. HERSHEY.

- STEAM BOILER SETTING. 7

No. 892,428. Patented Nov. 6,1888.

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UN TED STATES PATENT risen.

MARTIN E. HERSHEY, OF HARRISBURG, PENNSYLVANIA.

STEAM-BOILER SETTING.

SPECIFICATION forming part of Letters Patent No. 392,428, dated November6, 1888.

' Application filedMay 31, iesa- Serial No. 275,610. (No model.)

To all whom it may concern:

Be it known that I,-MARTIN E. HERSHEY,

' of Harrisburg, in the county of Dauphin and State of Pennsylvania,have invented certain new and useful'Improvenients in Steam-BoilerSettings; and I do hereby declare the following to be 'a full, clear,and exact description of the same, reference being had to theaccompanying drawings,forming a part of this specification, and to thefigures and letters of refereuce marked thereon.

The present invention has for its object to so construct aboiler-setting as that complete combustion is secured without thenecessity of a forced draft, the parts being rendered much more durablethan the ordinary setting, not liable to be clogged with dirt or brokenwhile in use, and withal so constructed as that ready access may be hadto all parts of the boiler for inspection or repair without destroyingthe setting.

To these ends the invention consists in certain novel features ofconstruction and combinations and arrangements of parts to behereinafter described, and pointed out particularly in the claims at theend of this specification.

In the accompanying drawings, Figure 1 is a longitudinal verticalsection through aboilersetting constructed in accordance with myinvention. Fig. 2 is a section on the line a; 00, Fig. 1. Fig. 3 is asection taken horizontally through the bridge-wall. Fig. 4is alongitudinal vertical section of the bridge-wall. Fig. 5 is a view of amodification. 1

Similar letters of reference in the severa figures indicate the sameparts.

The boiler-setting to which my invention is particularly applicable isthat commonly known as the \Veitmeyer setting, in which the larger partof the air for supporting combustion is taken in at the rear end andcaused to impinge on a flame-bed, A, underlying the rear end of theboiler, before reaching the ashpit,from whence it is distributed to thegratesurface. The flame-bed A referred to extends rearwardly from thebridge-wall, and I preferably construct it of rectangular blocks offirebrick, a, supported on the flanges of inverted T shaped girders 13,passing from side to side of the setting, the ends of the girders beingbracket-ledges on saidwalls, as will be readily understood. The flangesof the T- shaped girders are located at the bottom, thus insuring theproper positioning of the refractory blocks, but more particularly toprevent the exposure of much if any of the iron surface to the action ofthe flame, and at the same time present a relatively largeradiating-surface for heating the air passing through the flue beneath.

To supply air to the top of the bridge-wall D and cause the completecombustion of the gases passing off from the fire, lform fines (2,extending diagonally upward from the ash-pit, and over the upper ends ofthese flues locate suitable hollow fire-bricks with small perforationstherein, the interior cavities in such bricks being of considerablygreater area than the cross-sectional area of the supply-fines, thusforming expansionchambers in which the air is highly heated beforepassing out to commingle with the products of combustion.

The expansion-chamber may be continuous from one end of the bridge-wallto the other and formed of a single fire'brick of inverted- V shape orsemicircular; or it maybe divided into a number of separate chambersformed by independent bricks of substantially the same shape as shown.

The lines are formed by a series of castings, E, having the broad flator flanged bases 6, which rest on the inclined face of the bridge-.wall, and the narrow flat or flanged top R, connected to the base bythe webs 0 forming the divisions between the flucs. The tops E supportthe rectangular fire-bricks F, constituting the outside of the fines.The end bar, G, for supporting the rear ends of the gratebars, alsoserves as a support for the castings and fire-brick forming the flnes(I, being constructed for the purpose with the two rails g g, the formerserving to support the ends of the grate-bars and the latter the basesof the castings E, the webs 9*, connecting the two rails, beingpreferably s0 located as to fall in line with the division between thefines, air, of course, being admitted to the fines through the openingsin the end bar.

In order that no dirt or soot shall lodge in the fines d, the top andbottom of the castings E converge as they near the top,forming taperingfines opening out into the expansion-chambers, as before explained. Thusany dirt or soot will, when it enters said fines, at once fall clearthrough into the ash-pit.

As before explained, the ash-pit is supplied with air taken in from therear end and carried through the bridge-wall, a suitable steamsupplybeing located in the ash-pit, if desired, and an additional airsnpply atthe forward end, the air entering through the latter being heated bybeing passed around through the casing of the fire-door, which for thispurpose is made hollow, as shown, either by being cast in such form orby making the casing of two concentric rings, one smaller than theother, the whole being embedded in the wall of the setting independentof the boiler and readily removable for repair or renewal. The hollowcasing may be thick enough to extend below the end bar, II, and have theexit-apertures open directly into the ash-pit, although I prefer to formapertures in the dead-plate and run air-passages I down into theash'pit, as shown, the air-inlet passages K being always located at thetop of the casing on the outside, thus keeping up a constant circulationof air around in the casing from top to bottom, keeping it at all timescool, and at the same time effectw ally heating the air entering theaslrpit from the front.

It is obvious that the castings forming the flue (Z may be made in asingle piece, if desired, or as shown in Fig. 5, and that the form ofthe same may be varied considerably without departing from the spirit ofmy invention.

The advantages will now be readily comprehended. The flame-bed beingeasily removed and replaced by taking up the firebricks andsupporting-girders,the boiler may be easily inspected and repaired, andthe flame-bed being very thin-a feature rendered possible by thiseonstruction-eanses the air to be highly heated before its entrance tothe ash-pit, where it is distributed to the gratesurface and allowed topass up the lines (1 into the eXpansion-ehambers, the parts by having aconstant circulation of air around them being rendered practicallyindestructible, and the air supplied to the front of the ash-pit beingalso heated to a high degree while circulating through the fire-doorcasing.

Having thus described my invention,what I claim as new is- 1. In asteamboiler setting, the combination, with the bridgewvall and theair-passages for supplying air to the top thereof, formed by the metalbottom plates having the upwardly-extending webs or flanges, and therefractory blocks lying on the top of such webs, of hollow perforatedfire-bricks located over the mouths of such passages for distributingthe air, substantially as described.

2. In a steam-boiler furnace, the combination, with the bridge-wall, ofair-passages for supplying air to the top thereof, formed by the bottomplate having the upwardly-extending webs, and the refractory blockslying on the tops of such webs, substantially as described.

3. In a steam-boiler furnace, the combination, with the bridge-wall, ofthe passages for supplying air to the top of the same, formed by theplates having the upwardly-extending webs with flanged tops, and therefractory blocks resting on such tops, substantially as described.

4. In a steam-boiler furnace, the combination, wit-h the grate-bar, endbar, and bridgewall, of the plates having the upwardly-extending webs,with the refractory blocks on such webs, forming air-passages forsupplying air to the top of the bridge-wall and supported in position bythe end bar, substantially as described.

5. In a steam-boiler furnace, the combination, with the grate,end bar,and bridge-wall, of the bottom plates having the upwardly-extending webswith the flanged tops and the refractory blocks resting on such tops,the bottom plates and refractory blocks resting upon and supported bythe end bar, substantially as described.

6. In a steam-boiler furnace, the combination,with the grate-bars, bridge-wall and plates forming the air-passages, of an end bar having thetwo rails for supporting the grate-bars and plates forming theair-passages, respectively, the connecting-webs, and the aperturesthrough which the air passes to the top of the bridge-wall,substantially as described.

7. In a steam-boiler setting, the combination,with the boiler, thesetting-walls,and the supplemental walls or ledges on each side at thebottom, of the removable flame-bed n11- derlying and in proximity to theboiler, formed of the girders lying loosely on said supplemental wallsor ledges, and the refractory blocks removably supported on saidgirders, substantially as described.

8. In a steam-boiler furnace, the combination, with the grate, rearair-supply, and setting-walls having the projections or lcdges,of aflame-bed overlying said air-passage for heating the air therein,formcdof the T-shaped girders removably supported on the projections orlcdges,with the flanges down and exposed to the air beneath, and therefractory blocks removably supported on said flanges, substantially asdescribed.

MARTIN E. HERSHEY.

\Vitncsses:

MELVILLE Gnonon, THOMAS DURAN'I.

